Buttonhole-sewing machine.



G. A. DAHL. BUTTONHOLE $EWING MACHINE. APPLIOATION FILED NOV.19, 1908.

9 5 I PatentedFeb.2, 1909.

I mu

Q Tocll it may concern:

1 UNITED. STATES PATENT OFFICE",

CHARLES-IA. mnnor, Bos'roN, MASSACHUSETTS, ASSIGNORI TO'THE EEEeE BUTTONHOLE MACHINE COMPANY, OF BOSTON, MASSACHUSETTS; A CORPORATION OF MAINE.

Nbi 911,551:

Be it known that-.1, CHARLES AI-Dmr, a

" citizen of the United States, residing at Boston, county of Sufiolk, and State of Massachusetts, have invented an Improvement 'in- Buttonhole-Sewing Machines, of which the following; description, in connection with the, accompanying drawing, is a .specification like letters on the drawing, representlng like parts.

This invention relates to buttonhole sewing machines of the type wherein a needle as is shown and described in United States Patent N 0. 862238 granted. to me August 6, 1907, and my present invention relates more particularly to I the under thread-carrying mechanism of my patent, and has for its object certain novel features of construction whereby the operation and adjustment of the mechanism 1s much improved and facilitated,

The various novel features of my invention-will be fully described in the subjoined specification and particularly pointed out in t e following claims.

Eliggure 1 is a detail in elevation showing a ne e,

.and the circularly movable 'carner sustaining the means complemental to the needle making the stitch, with my present invention embodied therein, the parts shown being a sufiicient portion of a buttonhole sewing machlne to enable myinvention to be understood; lfiig. 2 is a top plan' view of the mechanism shown in Big. 1'; Big. 3 isgja rear 1 l elevation of the oscillating support detached,

and with the parts usually carried therebyremoved; Fig. 1 is a top plan view of the support; Fig. 5 is a erspectivewiew, enlarged, of one of the a justable stops for the loo spreader, to be described.

1% my patent h'reinbefore referred to the loop spreaders arepivotally mounted on the 'oscillatingsiipports an'd are'spring-actuated mono directlon and they are moved in the op'osite dlrect oifbjgla but I have in my present'invention .pro-

s eeten o1 Lettersgatent. Application filed November 19, 1908. Serial No. 463,460.

a spreader actuator,

an such 1s the genera .constructlon hereln,

Patented Feb. 2, 1909.

vided. means whereby the -spri-ng' -induced This, adjustment is of. great advantage .in enablingme to set the; loop spreaders prop+ erly an easilywithrelation to the loopers, and I have so constructed the adjustable sp'reader stops that they also serve as down,- holds'to retain the loopspreaders inoperaprov ded each spreader with .a shaft which is mounted to rock freely in a longbearing in the support, as will be described.

' Referring to Fig. 1, the eye-pointed needle (1, the carrierf lfi capable of a circular movement, its longitudinal central shaft 59 having at its upper end a studscrew 109 entering a link 1.08 connected at its u per end by stud screw 107'with a lever 106 ulcrumed at 105 at its lower end at 112 with the lever-lOfi and at its upper end at 114 with an arm 115 of the'osc' ating block or support 116, may be and are in general all substantially as in my said patent, and operate as therein set forth, the supporttbeing mounted to oscillate onta stud screw 117. Herein, however, I. have made some changes in the oscillating support 116, which is of general triangular shape and provided on eac gent sides with a air ofseparated. arms 120, 121, the arm 115 orming an extension of one of the arm 121, see Big. .3. 1.- Each pair of arms is drilled to form a long vings being upwardly divergent, and-the up per arms 120 are enlarged to rovide room or'sockets 123 and holes 124, est shown in Fig. 4. A.-threadcarrying looper 30 hasits shank inserted in one of the sockets. 123 and the other socket receives the shank of a nonthreadecarrying looper 31, substantially as in my' atent the-shanks of the loopers being set 'screws, as shown in Fig.- 1, The 100 spreaders' 32, 33co-act res ectively with t e loopers 30'and 31 and eac s reader has an ismountedtorock in one of the long beenmoyementof the spreaders-can be adjustably limited readily and with greataccuracyl on the carrier; and the link 113 connectedof its upwardly diver.-

finelyheld," in the sockets by suitable attached, elongated shaft 32 Fig.'.1,-which" tive position on the support. I have also bearing 122, see-dotted lines Fig. 3, the 'bearings 122, iving a firm and strong support to the sprea er in its angular movement when cooperating with the thread. A piece of s ring wire is bent around the hub 117 X of the support and its ends are carried upward and rearward, at 125, to bear against the outer ends of the loop spreaders, to swing the latter forward away from the path of the loopers, such spring-induced movement being limited by means to be described. Headed screws l26 on the arms 121 hold the spring in place on the support, this arrange: ment simplifying the const'fuotion of the spring and obviating the use of separatev coiled springs as shown in my patent. The loop spreaders are swung or rocked in opposition to the action of the spring by the spreader actuator H, having the arms h, h, as 111. my patent, and need not be described zo herein in detail.

The adjustable spreader stop is shown separately in Fig. 5, one of such stops being provided for each spreader, each stop comprising a cylindrical stud 127 having at its upper end a laterally extended stop finger 128 and an overhanging ear or downhold 129. l The studs 127 fit into the holes 124 in the upper arms 120 of the support 116 and the stop finger of each stop bears against the front edge of the adjacent loop spreader when the spreaders are at rest, while the downholds 129 overhang the tops of the spreaders, as shown in Fig. 2 and retain the shafts of the latter in their bearings 122 while permitting them to rock freely. The arms 120 are provided with threaded holes to receive set screws 130 to bear against the studs 127 of the spreader stops, the screw holes intersccting the holes 124, so that by setting up the set screws after the stop fingers are in the adjusted angularv position said fingers will be fixedly held in such adjustment. By means of the angular adjustment of the stop fingers, the s ring-induced movement of the loop sprea ers can be regulated with great accuracy, to bring them into the exact relation with the loopers, and the adjustment can be easily and quickly changed as required. It will be seen that ample angular adjustment of the fingers is 'ermitted without at all in terfering with t e functions of the .downholds 129, s0 that the spreader's will beproperly retained in position. p

Should it become necessary to replace a loop spreader the set screw of its sto is loosened and the stud is turned far enhug to swing the downhold clear of the spreader,

whereupon-it canbe lifted out and another one substituted.

tween the face of the support and the back of the guard into proper osition for the loops of thread to be manipu ated in the formation. of the stitch as the needle rises.

Various changes in details of co.-istru :tion may be made by those skilled in the art without departing from the spirit and scope of my invention as set forth in the claims annexed hereto.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is 1. In under thread-carrying mechanism for buttonhole sewing machines, an oscillating support, a plurality of loopers fixedly mounted. thereon, a plurality of springcontrolled loop spreaders pivotally mounted on the support, and an angularly adjustable stop and downhold for each loop spreader to retain thesame on the support ahd limit spring-induced movement of the spreader.

2. In under tln'ead-carrying mechanism ing support, a plurality of loopers fixedly mounted thereon, a plurality of springcontrolled loop spreaders pivotally mounted on thesupport, an angularly movable stud mounted on the support adjacent each loop spreader and having a lateral stop-finger to cooperate therewith, and means to act upon the studs and maintain them in angularly adjusted position.

3. In under thread-carrying mechanism for buttonhole sewing machines, an oscillating support having pairs of separated and alined bearings, a plurality of loopers fixedly mounted on the support, a plurality of loop spreaders each having an attached shaft mounted to rock in a pair of the separated bearings, and an angularly adjustable stop for each loop spreader, each stop having a downhold overhanging the adj a'cent loop spreader to retain the shaft thereof in its bearings.

4. In under thread-carrying mechanism for buttonhole sewing machines, an oscillating support having upwardly diverging bearings, a plurality of loopers fixedly mounted to retain the stops in adjusted position.

ing support, apl'urality of loopers fixedly mount-e thereon, a plurality of loop spreaders 'pivotally mounted on the support, a bent spring fixedly held on the, support and having its free endscooperating with the spreaders outside their pivotal points, and adjustable stops to limit spring-induced movement of the loop Spreaders.

6. In under thread-carrying mechanism for buttonhole sewing machines, an oseillatfor buttonhole sewing machines, an oseillat-' on the support, a plurality of-spring-con trolled loop spreaders ,each having an attached shaft mounted to rock in one of the beariiigs, a-combined downhold and adjust able stop for each loop spreader, and means t 5. In underathread-carrying mechanism for buttonholesewing machines, an oscillatiing su p drt, av tplurality of loopers fixedly I In testimony whereof, I have signed my mounte theron, a. plurality of spring-conname to this specification, in the presence 10 trolled loop Spreaders pivotally mounted on of two subscribing vwltn sses. L I the sup ort, adjustable stops to limit spring- CHARLES A DA .5 induce movement of the loop Spreaders, and a needle-guard on the support between the leopers and he'lbw the path of movement thereof.

Witnesses: WILLIAM J. MQLAUGHLIN, THOMAS J. OARTY. 

